Fumble

About

Fumble is a macOS menu-bar app that watches your typing locally throughout the day and works out which keys and key pairs cost you the most time. It ranks weak keys by time lost (how far a key is over your baseline times how often you press it) rather than raw slowness, then builds lessons around them. The WPM figure shows what it excluded, such as software-injected keystrokes, autorepeat and idle time.